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java.lang.Objectaos.jack.jak.util.Watchable
aos.jack.jak.cursor.Cursor
aos.jack.util.cursor.Change
The Change class is a class that implements the necessary logic for a Cursor tied to Observable objects. A Change cursor is intended to be used in @wait_for statements, to block the condition testing until the Observable notifies. More exactly, the Change cursor makes the condition be triggered on a notification from the Observable. Thus, a conjunction of several Change cursors will be woken up by a notification from any of the Observables.
Field Summary |
Fields inherited from class aos.jack.jak.cursor.Cursor |
FALSE, falseCursor, TRUE, trueCursor, UNKNOWN |
Constructor Summary | |
Change(java.util.Observable o)
Constructs a Change Cursor to an Observable. |
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Change(java.util.Observable o,
boolean initial)
Constructs a Change Cursor to an Observable. |
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Change(Watchable w)
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Change(Watchable w,
boolean first)
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Method Summary | |
protected boolean |
condition()
Determines whether the particular change has occurred. |
void |
finished()
This informs the cursor that it is not going to be used again. |
boolean |
isTriggered()
Returns true. |
boolean |
next()
Used to test if the Observable has changed and if the condition is true. |
void |
register(java.util.Observer o)
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Cursor |
reset(aos.jack.jak.core.Generator g,
int index)
Resets the Cursor to its original state. |
void |
undo()
Undo tells the cursor to backtrack anything it has done. |
boolean |
unRegister(java.util.Observer o)
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Methods inherited from class aos.jack.jak.cursor.Cursor |
negate |
Methods inherited from class aos.jack.jak.util.Watchable |
addObserver, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public Change(java.util.Observable o, boolean initial)
o
- The object to be observedinitial
- Specifies whether to test the cursor condition on
first access to the cursor.public Change(java.util.Observable o)
o
- The object to be observed.public Change(Watchable w, boolean first)
public Change(Watchable w)
Method Detail |
public boolean isTriggered()
isTriggered
in class Cursor
public boolean next()
next
in class Cursor
protected boolean condition()
public Cursor reset(aos.jack.jak.core.Generator g, int index)
reset
in class Cursor
g
- The generator that generates an equivalent cursorindex
- The index of the equivalent cursor in the generator.
public void undo()
Cursor
undo
in class Cursor
public void finished()
Cursor
finished
in class Cursor
public void register(java.util.Observer o)
register
in class Cursor
public boolean unRegister(java.util.Observer o)
unRegister
in class Cursor
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US Government Restricted Rights
The JACK Modules and relevant Software Material have been developed entirely at private expense and are accordingly provided with RESTRICTED RIGHTS. Use, duplication, or disclosure by Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of DFARS 252.227-7013 or subparagraph (c)(1) and (2) of the Commercial Computer Software Restricted Rights and 48 CFR 52.2270-19, as applicable.